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Thread: quicker to rebuild raid using backup drive?

  1. #1
    Join Date
    Jul 2009

    Default quicker to rebuild raid using backup drive?


    question about this setup:

    2 drives in a Raid 1 + 1 backup drive (Raid 1 backed up every hour to backup).

    Can anyone tell me... if 1 of the drives in the Raid 1 failed, would the raid rebuild quicker if the backup drive was used as the replacement with a copy of the data (within an hour old) already on it?

    Or is it just as quick to use a blank drive?


  2. #2
    Join Date
    Feb 2001
    on the landline, Mr. Smith


    Most RAID 1 will run through the entire drive and check parity during a rebuild, so it doesn't seem to matter if it has most of the data, or is blank - in my experience. If this is a hot swappable set-up, plug in the drive of your choice and it will typically rebuild on the fly, in the background, with no down the rebuild time doesn't really matter.

    If this is a software mirror, SoftRAID is worth the money to monitor this entire process. Much more feedback and info than Apple gives via DU.
    "Imagine if every Thursday your shoes exploded if you tied them the usual way. This happens to us all the time with computers, and nobody thinks of complaining." -- Jef Raskin

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